"Oi, brats!"

Luffy's head snapped up, his face splitting into a grin. "Gramps! You're up early!"

Zoro paused mid-swing, panting slightly, but his eyes sharpened when they landed on Garp.

"Luffy," Garp said, jerking a thumb at Zoro, "mind if I borrow your student for a bit?"

Luffy blinked, then beamed. "Sure! But be careful, Gramps—Zoro's 's my first student. He's super strong!"

Zoro scoffed, rolling his shoulders. "Don't go easy on me, old man."

Garp barked out a laugh. "We'll see about that!"

And then—

BAM!

Garp moved faster than a normal human should, his fist crashing toward Zoro like a cannonball. But the boy was already twisting, his wooden sword flashing up in a perfect parry. The impact sent shockwaves through the air, sand spraying up in a gust. Zoro skidded back, arms trembling from the force, but his stance never broke. His teeth were bared in a fierce grin.

Garp whistled. "Not bad, kid."

Then the real fight began.

Zoro lunged, his wooden sword a blur. His strikes weren't just strong—they were smart. Every slash had purpose, every step calculated. Garp dodged, blocked, countered, but with each exchange, he could feel it—the raw, untamed potential burning in the boy.

"Hah!" Zoro spun, his wooden blade whipping toward Garp's ribs. The Marine barely sidestepped in time, but the wind pressure alone stung.

Garp's eyes gleamed. This kid...

At ten years old, Zoro was already faster than most grown swordsmen. His instincts were razor-sharp, his endurance unnatural. And his drive—that unshakable will—was something Garp had only seen in a handful of fighters in his lifetime.

If he keeps growing like this...

A memory flashed in Garp's mind—Dracule Mihawk's cold, golden eyes. Shanks' grin as he clashed swords with the best of them.

He could reach them.

With a sudden burst of speed, Garp feinted left, then—

THWACK!

His knuckles lightly tapped Zoro's forehead, sending the boy sprawling into the sand.

Luffy gasped. "ZORO!"

But Zoro was already pushing himself up, panting, his grin never fading. "Tch. Almost had you."

Garp laughed, loud and booming. "Almost doesn't count, brat! But damn, you're good!" He ruffled Zoro's hair roughly, ignoring the boy's protests. "If you keep training like this, you might just surpass that hawk-eyed bastard one day!"

Zoro's eyes burned. "Not might. Will."

Garp's grin turned approving. "Heh. That's the right attitude."

Luffy bounded over, throwing an arm around Zoro's shoulders. "See?! I told you he was strong!"

Zoro huffed but didn't shrug him off. "Still lost."

"Only 'cause Gramps cheated!" Luffy declared.

"Cheated?!" Garp bellowed. "That's called experience, you little—!"

But Luffy was already dragging Zoro away, chattering about meat and training and how they'd definitely win next time.

Garp watched them go, arms crossed, his chest swelling with something he couldn't quite name.

Yeah. The future's in good hands.

And if that meant he had to train two little monsters now instead of one?

Well.

He'd never been one to back down from a challenge.

Zoro lay sprawled on his back, one arm thrown over his eyes, his chest rising and falling in the steady rhythm of deep sleep. The usual sharpness of his features had softened in rest, making him look younger—just a boy, not the fierce swordsman-in-training he was becoming.

Luffy sat cross-legged beside him, idly plucking blades of grass and humming a quiet, tuneless song. It wasn't anything recognizable—just a soft, meandering melody that rose and fell like the tide, something made up on the spot but soothing all the same. His fingers occasionally brushed Zoro's shoulder, as if to reassure himself that his first student was still there, still safe.

Garp watched them from a distance, arms crossed.

Zoro was strong—stronger than any kid his age had any right to be. But if he was that powerful...

What about Luffy?

The thought itched at him.

"Oi, Luffy," Garp called, keeping his voice low so as not to wake Zoro. "Come here a sec."

Luffy glanced up, then carefully untangled himself, making sure not to jostle Zoro. He trotted over, tilting his head. "What is it, Gramps?"

Garp jerked his thumb toward the empty stretch of shoreline farther down the beach. "Let's spar."

Luffy blinked. Then his eyes lit up. "Okay! But let's go over there." He pointed away from the tree. "Don't wanna wake Zoro."

Garp snorted. "Since when are you this considerate?"

Luffy just grinned. "Since I became a teacher!"

They stood facing each other on the damp sand, the waves a distant murmur. Garp rolled his shoulders, cracking his neck. "Don't hold back, brat."

Luffy bounced on the balls of his feet, his usual playful energy sharpening into something focused. "I won't!"

Then he moved.

Garp barely had time to register the shift in the air before Luffy was there, fist already mid-swing. He blocked on instinct, forearm meeting small knuckles with a thud that sent a shockwave through the sand.

What the—?!

Luffy didn't let up. His next strike came faster, his footwork precise, his body twisting with a fluidity that hadn't been there the last time they'd fought. Garp dodged, but Luffy adjusted mid-motion, his balance impeccable, his movements eerily efficient.

Since when was he this strong?

Garp grinned, excitement flaring in his chest. "Not bad!" He retaliated, upping his speed just a fraction—enough to test, not enough to overwhelm.

Luffy kept up.

No—more than that. He adapted. Each time Garp shifted tactics, Luffy read it, countered it, his reflexes honed to a razor's edge. His punches carried real weight now, his kicks snapping out with dangerous accuracy.

Garp increased the pressure.

Luffy matched it.

Then—

Luffy feinted left, and Garp saw it coming, bracing for the obvious strike.

But Luffy changed the attack mid-motion.

His small fist connected with Garp's guard—and shoved him back.

Not much. Just a step.

But a step.

Garp's boots dug grooves into the sand.

Silence.

Then—

"HAHAHAHA!" Garp's laughter boomed across the beach, loud enough to startle seagulls into flight. "THAT'S MY GRANDSON!"

"SHHHH, GRAMPS!" Luffy hissed. "You're gonna wake him up!"

Garp blinked down at his grandson, whose entire face was scrunched up in the most serious expression he'd ever seen on the usually carefree boy. For a split second, the legendary Marine who had faced down entire pirate crews without flinching froze like a scolded recruit.

Then, with great effort, he lowered his voice to a rumbling whisper. "Ah. Right. My bad." He even had the decency to look sheepish.

Luffy peered at him suspiciously before finally releasing his mouth. "You gotta be quiet," he admonished, crossing his arms like a miniature schoolteacher. "Zoro worked really hard today! He needs his nap!"

The sheer absurdity of Monkey D. Garp being lectured on volume control by a five-year-old was almost too much. A snort escaped him before he could stop it.

Luffy's glare intensified.

"Sorry, sorry," Garp muttered, holding up his hands in surrender. He couldn't help the grin tugging at his lips, though. Damn if the kid wasn't adorable when he was trying to be responsible.

From the tree, Zoro shifted slightly in his sleep, one hand curling tighter around the hilt of his wooden sword. A quiet, contented sigh escaped him. Luffy's stern expression immediately melted into something unbearably soft. "See?" he whispered, tugging at Garp's sleeve. "He's dreaming about getting stronger. We can't interrupt that."

Garp felt something suspiciously warm squeeze in his chest.

This kid...

He let Luffy drag him farther down the beach, away from the sleeping swordsman, before finally speaking again—at an appropriately hushed volume, of course.

"Since when do you care so much about naps?"

Luffy shrugged, kicking at a seashell. "Dunno. Just do."

Garp stared at him. Then, very carefully, he reached out and ruffled Luffy's hair—gently, this time.

"...You're a good teacher, brat."

Luffy beamed up at him, all earlier scolding forgotten. "Shishishi! I know! Did I surprise you, Gramps?"

"Damn right you did!" Garp's pride swelled in his chest. But even though he was amused, his mind was racing. What was going on? Luffy wasn't just stronger. He was different. How he moved, what he did without thinking – it wasn't just from practice. It was like he was born with it. And that last hit... Garp had felt that power. He needed to know what was happening.